It all sounds normal but the specific ports & IP's really help to tell the story.

1. OK
2. Multiple IP contacts are on a web page (ads, content, graphics, etc). The port will Establish and go to Time Wait, where it can be for up to 4 min or so. Then then should go away. Firefox will keep some ports Established (IP of 127.0.0.1) for communication back to the PC, called 'loopback'. These are normal as well.
3. normal
4 & 5. depends on the specific info but probably not a problem
6. normal - whois will give a range of addresses assigned to the registrant - the specific one you are looking for should be within that range.